π*x-2.3*sqrt(1-x*x)≥0
    (x+2)^(-4)<(1-2x)^(-4)
    abs(x+2)>abs(1-2x)
    3x^2-4x>0
    x*0.3+30= x*0.6
    28<0.5a+1.5(30-a)<30
    －x^(2)＋x-4<0
    x^(2)－2x＋2>0
    1+2x>3x-3
    30*x+20*(100-x)≥2580
    （2500*12*0.9-70%*65*X*6.3%）/（30%*65*X*5%*65*X）=3.8%
    130*x+100*(100-x)≤11815
    (5/3)x+5(4-x)≤2（4-x）
    ((7-x)/2)-3≤(（3+4x)/5)-4
    （1/2)x-(x-3)>1/4
    x-2(x-3)>4
    (4x-10/5)-((5-x)/2) ≤3-2x/3
    4x-10/5-((5-x)/2)≤3-2x/3
    x-(7x-8)/2≤((6x+10)/3)-1
    -2≤4/a

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